different between subroutine vs subprocedure

English

sub- +? routine

subroutine (plural subroutines)

(computer science) A section of code, called by the main body of a program, that implements a task.

Borrowed from English.

subroutine f (invariable)

sub- +? procedure

subprocedure (plural subprocedures)

A procedure forming part of a larger procedure.
- 1973, The Oregon State Bar Bulletin (volume 34, page 7)
  It would consist of a schedule of the common types of legal services (divided into subtypes or subprocedures) with a unit rather than dollar amount specified for each. Each unit might be the rough equivalent of one hour of an attorney's time […]
(computer science) A procedure that can be called by higher-level procedures as part of their operation.
Synonym: subroutine

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